Rotary sander



D. D. BAKER ROTARY SANDER April 27, 1954 Filed July 18, 1952 INVENTORDan 0 Baker BY M r%m ATTORN E YS Patented Apr. 27, 1954 UNITED STATESPATENT OFFICE I 2,676,439 ROTARY SANDER Dan Dysart Baker, New Orleans,La. Application July 18, 1952, Serial No. 299,723

6 Claims.

N This invention relates to a sander and more particularly to arotarysander which ismounted in cooperating relation to a table and is usedfor sanding edge faces of boards or side faces of timbers or the like.

When a sander of this type is in use, a board or the like is placed upona table and moved lengthwise at an angle so that it progressively movesbeyond the side of the table at which the rotary sander is mounted.During this movement the edge face of the board presented toward therotary sander moves across a beveled edge face of the sander, thuscausing this edge face of the board to be sanded and thus a smoothsurface is produced. The sander must be provided with an abradingsurface which is best suited to the type of wood being treated and itis, therefore, one object of the invention to provide a rotary sanderwherein a disk is firmly mounted upon a rotatably mounted shaft andcarries a ring which is firmly secured about the peripheral edge portionof the disk to turn therewith, the ring having a beveled edge face uponwhich a strip of sand paper or the like is mounted, but may be removedwhen it is worn to such an extent that replacement of the sand paper isnecessary.

It is another object of the invention to provide a rotary sander whereinthe disk carries a ring of such construction that it may be easilymounted about the disk and firmly but detachably secured thereto andthus allow a ring having a beveled edgeface of predetermined angle to beremoved and another ring applied having a beveled edge face at an angledifferent from that of the ring previously used.

Another object of the invention is to provide a sander wherein the axisof the rotatably mounted shaft is disposed in such a horizontal planethat this axis will be midway the thickness of the board being operatedupon and thus cause the beveled edge face of the ring to move in such adirection relative to the board that the edge face of the board will besanded and smoothed without leaving'marks which will disfigure thesurface of the board.

Another object of the invention is to provide a ring which is splitalong a radially extending plane through its circumference, thusproviding a unitary ring which may be constricted about a disk to whichthe ring is applied and be very firmly held in .gripping engagement withthe disk.

'Another object of the invention is to provide a ring which may beformed either of solid metal or of sheet metal and in each case consistsof a splitring carrying ears projecting from the ring at opposite sidesof the split and carrying a bolt by means of which force is exerted toconstrict the ring about the disk upon which it is mounted.

It is another object of the invention to provide a sander having a novelbeveled edge face covered with an abrasive material serving to impart asmooth surface to a confronting edge face of a board or the like movedlongitudinally in crossing relation to the said edge face of the sander.

With these and other objects in view the invention consists of animproved construction and arrangement of parts illustrated in theaccompanying drawings wherein:

Fig. lis a top plan view showing the rotary sander disposed at one sideof a table and a board resting upon the table with a portion of theboard projecting from a side thereof and across the beveled edge face ofthe sander;

Fig. 2 is a view showing the rotary sander in elevation and the shaftupon which it is mounted in transverse section;

Fig. 3 is 'a sectional view taken vertically through the sander alongthe line 33 of Fig. 2;

Fig. 4 is a perspective view of the rotary sander with a portion thereofbroken away;

Fig. 5 is a perspective view showing a portion of a ring which is formedof sheet metal instead of solid metal;

Fig. dis a perspective view showing a rotary sander wherein a ring isomitted and a strip of sand paper or the like applied to a beveled edgeface of the sander.

The sanding apparatus shown in Fig. 1 includes a table .I which isgenerally of the type shown in Patent 2,068,964, issued January 26,1937. This table has a flat top across which extend metal channel. bars2 which are countersunk in the table and between which is mounted aplate 3 formedwith an elongated opening 4 through which is exposed aslot 5 for reception of a rotary saw. This saw, which is not shown, ismounted under the table top in a conventional manner in order that itmay be moved vertically through the slot 5 into and out of position foruse, and it will be understood that when the table is used for-sanding,the saw blade is removed.

Strips 6 extend along opposite edges of the table top at which the metalstrips 2 terminate and upon one of these strips or tracks 6 is mounted ablock -1 which is shiftable along the track to adjusted positions. Awork guide 8 is pivotally connected with the block 7 by. a fastener 9 inorder that the work guide may be swung about its pivotal mounting to anangularly adjusted 3 position where it is releasably secured by afastener In which may be a set screw or the like.

Adjacent one side of the table is a rotary sander H carried by a shaftl2 which is rotatably mounted through a suitable number of bearings l3each of which has a depending shank l4 connected with a supportinstandard H). In Fig. 3, the shank 14 of the bearing l3 has been shownformed with a longitudinally extending slot 16 through which a bolt I1passes in order that the bearing may be vertically adjusted and thelongitudinal axis of this shaft disposed in a horizontal plane whichwill dispose the axis of the rotary sander above the the board It thatthe said axis of the shaft will be midway the thickness of the board, asclearly shown in Fig. 2. This board rests upon thetable with an edgeface of the board presented towards and in fiat contacting engagementwith a side face of the work guide 8 and as the board is movedlongitudinally of the work guide it progressively moves across the edgeface of the rotary sander and its side edge face which confronts thework guide will be acted upon by the sander and this edge face of theboard sanded in such a manner that the surface will be very smooth.

When a board is, pushed forwardly along the table and across the bevelededge face of the sander it progressively moves the table and its portionprojecting from the table will be liable to sag and tip the boardvertically and out of accurate engagement with the wheel. This may beprevented by placing an auxiliary table in position to receive theforwardly projecting portion of the board or by provision of a shelf(not shown) extending diagonally from the table top and supported fromthe table by a suitable mounting such as a bar extending transverselyacross connected with the strip or track at the other side of the tablefrom the track 6 with which the rip fence 8 is connected.

The rotary sander consists of a circular disk l9 which is of an eventhickness throughout its area and at its center formed with a rearwardlyprojecting bossor hub 29 through which is formed a bore or opening 2| tosnugly receive the reduced forward end portion 22 of the rotatable.shaft l2. After the disk has been, applied to the shaft a set screw 23mounted in a radially extending threaded opening 24 formed in the hub orboss is tightened and the disk willthus be firmly secured to the shaftand turn with the shaft.

A ring 25 fits about the disk and is firmly secured so that it hasfrictional gripping engagement with the disk and turns with the disk.This ring may be a solid ring formed of resilient metal or. othersuitable material and at one point about its circumference the ring isslit as shown at 26 so that. the ends of the ring are spaced from eachother a slight distance, as shown in- Fig. 2.

A recess 21 is formed about the inner marginal portion of the ring andis of such dimensions that the disk will fit snugly therein. Ears 28 and29. project. rearwardly from the ring at. opposite sides, of the slit26' and one of these cars is formed with a threaded opening 30; whilethe other is formed with an opening 3| which is unthreaded. Therefore,after the ring has been applied about the disk a securing; screw 32 maybe passed, through the. unthreaded opening 31 and screwed into thethreaded opening 30- until the ends of the ring are drawn towards eachother to such an extent that the ring will be tightly table in suchrelation toforwardly beyond the rear end of the shelf and 4 clampedabout the disk. The outer marginal edge face 33 of the ring is beveledfor its full width and against this beveled edge face of the ring ismounted a strip 34 having its outer surface coated with an abrasivematerial which may be sand, emery, or the like. The angle of the beveledsurface of the ring may be any angle desired, such for instance, as anangle of 20 or 45, and it will be understood that the rings may be madein sets each of which has its beveled edge face at a different anglefrom other rings of the set. Therefore, a person usin the sander mayselect a ring having its edge face at a desired angle and by setting thework guide so that it extends at the same angle as the edge face of thering, a board placed against the rip fence and slid longitudinallyacross the edge face of the rotary sander will move, at such an anglethat it conforms to the angle of the rotary sander, and as the boardmoves across the rotary sander the sanding action will be diagonally ofthe board and produce a very smooth surface.

Instead of forming the ring of solid resilient metal or other suitablematerial, it may be formed of sheet metal. Such a ring is illustrated inFig. 5. This ring is preferably formed from a single blank of sheetmetal, but it may be made from two or more pieces welded or otherwisesecured together. It has a circular rear wall 35 and from the outerperipheral edge of this rear wall extends a diagonally disposed outermarginal wall 36 corresponding to the diagonally extending edge face ofthe ring 25. An annular flange 31 extends from the marginal wall 36towards the rear wall 35 and carries a wall portion 38 which cooperateswith it to form a recess 39 correspond.- ing to the recess 21. About theinner marginal edge of the rear wall 35 the sheet metal is bent to forma narrow circumferentially extending inner edge face or marginal wall 49which in its turn is bent to form a flange 41 to which the wall portion38 is welded or otherwise firmly secured. The sheet metal ring thusconforms to the shape of the solid metal ring and has its ends spacedfrom each other to provide a slit 42 corresponding to the slit 25.Tongues 43 which are integral with the rear wall 35 are bent so thatthey extend rearwardly from the rear wall at. opposite sides of the slit42, and. through these tongues or cars 43 are formed aligned openings 44to receive a bolt 45 carrying a nut 46. By tightening the nut 46 thering will be constricted about the disk about which it is disposed andhave firm gripping engagement with the disk.

In. Fig. 6 there has been shown an embodiment of the invention wherein adisk 47 is formed at its center with a rearwardly extending hub 43through which a bore or opening 19 is formed to receive the reduced endportion 22 of the shaft l2. A set, screw 5.?! is threaded into the hubradially thereof and after the disk has been appliedto the shaft the setscrew is tightened. to firmly hold the disk upon the shaft. This diskcorresponds in diameter to the diameter of. the ring which is mountedabout the disk 19' and has abevelededge face 5! upon which is mountedastrip. 52 having its outer surface coated with sand, emery, or anyother suitable abrasive material.

I claim:

1. A rotary sander comprising a rotatable shaft, a. circular disk of aneven thickness throughout its area, a central boss carried by said diskand extending rearwardly therefrom, said bos being formed with a'center'bore passing through the disk and with a threaded side opening, saiddisk being mounted upon said shaft with the shaft fitting snugly in thebore and firmly held therein by a set screw mounted in the threadedopening, a ring about said disk split transversely at a plane throughits circumference and at its end carrying rearwardly projecting earsformed with aligned openings, the opening in one ear being threaded andthe opening in the other ear unthreaded, an adjusting screw passingfreely through the unthreaded opening and engaged with the threads ofthe threaded opening, said ring having its inner marginal portion formedwith a circumferentially extending recess constituting a seat into whichthe marginal portion of the disk snugly fit and is firmly held bytightening the adjusting screw, said ring having a sloping peripheraledge face extending at an incline the full distance between front andrear sides of the ring, and abrading material covering the entiresloping edge face of said ring.

2. A rotary sander comprising a circular disk of even thicknessthroughout its area and having at it center a socket for receiving arotatable shaft and thereby mounting the disk upon the shaft to turntherewith, a resilient split ring fitting about the circumference ofsaid disk and having spaced ends carrying cars, a fastener carried bysaid ears and holding the ring constricted about the disk in tightgripping engagement therewith, said ring being formed about its innnerperiphery with a continuous recess open along the front and inner sideedge faces of the ring and constituting an annular seat into whichmarginal portions of the disk fit, said ring having a transverselysloping outwardly peripheral edge face, and abrasive material coveringthe said peripheral edge face of said ring.

3. A sander comprising a ring of dimensions adapting it to fit about acircular disk of predatermined diameter adapted to be mounted upon arotatable shaft, said ring being split at a point about itscircumference and formed of resilient sheet material and having a flatcircular rear wall, a sloping outer peripheral wall extending forwardlyfrom the outer marginal edge of the rear wall at an inward incline, ashort inner peripheral wall extending forwardly f om the inner marginaledge of the rear wall and of appreciably less depth than the outerperipheral wall, a front wall disposed in spaced parallel relation tosaid rear wall and about its inner marginal edge being connected withthe front edge of the inner peripheral wall, an annular shoulderextending between the front edge of the sloping outer peripheral wall tothe outer marginal edge of the front wall and together with the saidfront wall defining an annular disk-receiving recess, perforated earsextending rearwardly from ends of the rear wall at opposite sides of thesplit in the ring, and a fastener passing through the perforated earsand serving to contract the ring into binding engagement about a diskseated in the rece s when tightened.

4. In a sanding apparatus, a table having a top, a rotatable shaftspaced from a side edge of the table top and disposed at right angles tothe said side of the table top, a track extending along a side edge ofthe table top at right angles to the said side edge of the table top, arotary sander mounted upon said shaft at the end thereof adjacent thefirst mentioned side edge of the table top and having a beveledperipheral edge face sloping towards the table, and a work guideshiftable along said track towards and away from the first mentionedside edge of the table top to adjusted positions and extending acrossthe table top and pivotally mounted for movement to a position in whichit extends parallel to the transverse slope of the said beveled edgeface of the rotary sander.

5. In a sanding apparatus, a table having a flat top, a rotatable shaftspaced from a side edge of the table and disposed at right angles to thesaid side edge of the table and shiftable vertically to a position in ahorizontal plane above the plane of the upper surface of the table top adistance corresponding to one-half the thickness of a board to besanded, a rotary grinder carried by said shaft at the end thereofpresented towards the table and having a beveled peripheral edge faceconstituting a grinding surface, and a work guide shiftable along theupper face of the table top towards and away from the said side edgethereof to adjusted positions and pivotally mounted for horizontalswinging movements to an angularly adjusted position disposing itparallel to the transverse incline of the beveled edge face of therotary grinder.

6. A rotary sander comprising a rotatable shaft, a circular disk of aneven thickness throughout its area mounted upon and turning with saidshaft, a ring about said disk split transversely at a plane through itscircumference and at its ends carrying rearwardly projecting ears formedwith aligned openings, an adjustable fastener passing through saidopenings and tightened to draw the ears towards each other and contractthe ring about said disk in tight gripping engagement therewith, saidring having its inner peripheral portion formed with a circumferentiallyextending recess constituting a seat in which marginal portions of thedisk fit and are firmly held by frictional grip of the ring, said ringhaving a radially sloping peripheral edge face extending at an inclinethe full thickness of the ring, and abrading material covering thesloping edge face of said ring.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,193,525 Dosch Aug. 8, 1916 1,288,561 Gouldbourn Dec. 24,1918 1,292,372 Reisch et al Jan. 21, 1919 1,929,960 Teebe Oct. 10, 19331,965,707 Levoy July 10, 1934 2,483,369 Louoony et a1. Sept. 27, 1949

